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High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles
Author(s) -
Mata María,
CatalánGómez Sergio,
Nucciarelli Flavio,
Pau José L.,
Molina Sergio I.
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201902920
Subject(s) - plasmon , materials science , electron energy loss spectroscopy , context (archaeology) , gallium , surface plasmon , nanotechnology , optoelectronics , nanoparticle , surface plasmon resonance , spectroscopy , optics , transmission electron microscopy , physics , quantum mechanics , metallurgy , biology , paleontology
Plasmonics has emerged as an attractive field driving the development of optical systems in order to control and exploit light–matter interactions. The increasing interest around plasmonic systems is pushing the research of alternative plasmonic materials, spreading the operability range from IR to UV. Within this context, gallium appears as an ideal candidate, potentially active within a broad spectral range (UV–VIS–IR), whose optical properties are scarcely reported. Importantly, the smart design of active plasmonic materials requires their characterization at high spatial and spectral resolution to access the optical fingerprint of individual nanostructures, attainable by transmission electron microscopy techniques (i.e., by means of electron energy‐loss spectroscopy, EELS). Therefore, the optical response of individual Ga nanoparticles (NPs) by means of EELS measurements is analyzed, in order to spread the understanding of the plasmonic response of Ga NPs. The results show that single Ga NPs may support several plasmon modes, whose nature is extensively discussed.